A student weighing 300 N climbs a flight of stairs 7.0 m high in 8 s. What power is required to perform this task?
a. 2100 J
b. 2400 J
c. 2100 W
d. 2400 W
e. 262.5 W
Answer: e. 262.5 W
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The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed up out of the page, the direction of the magnetic field at P is closest to the direction of
A. E. B. F. C. G. D. H. E. A.
The _____ is a geologically brief period about 540 million years ago during which fossil evidence indicates Earth life became complex and diverse
A) Cambrian explosion B) Paleozoic era C) Renaissance D) Ordovician
Why is the air at higher altitudes cooler than that at lower altitudes?
A. Because of the relation expressed in Charles' Law, V/T = constant. B. Because of the relation expressed in Gay-Lussac's Law, P/T = constant. C. Because of the relation expressed in Boyle's Law, PV = constant.
A rock is thrown from the upper edge of a tall cliff at some angle above the horizontal. It reaches its highest point and starts falling down
Which of the following statements about the rock's motion are true just before it hits the ground? (There could be more than one correct choice.) A) Its horizontal velocity component is zero. B) Its velocity is vertical. C) Its vertical velocity component is the same as it was just as it was launched. D) Its horizontal velocity component is the same as it was just as it was launched. E) Its speed is the same as it was just as it was launched.